feat(authz): add PermissionStore contract with memory adapter and conformance suite

packages/authz/test/store-memory.test.ts

@@ -0,0 +1,4 @@
+import { memoryPermissionStore } from "../src/store.ts";
+import { runStoreConformance } from "./store-conformance.ts";
+
+runStoreConformance("memory", async () => memoryPermissionStore());